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I would say not 90%, but at least 75%.
I have a Model 94 30-30 AE that had open sights for 30+ years and scoped for last two, I bought a bolt action 308 six years after the 30-30 for slip hunting....

I don't know if the pre-64s are any better, I know people much prefer the pre-64 model 70 bolt action but no idea for lever actions, though there does seem to be a preference for those made in New...